Luster Leaf pH Soil Tester 1 pk (Pack of 12)This handy unit is easy to use and very portable. Simply take a small soil sample and mix it with water and the special activator gel cap to instantly assess soil pH. Kit includes: color comparator, 10 pH test capsules, complete instructions for adjusting soil pH and pH preferences list for over 450 plants for the home, yard and garden. All you do is put a sample of soil into the comparator, add powder capsule, add water, shake and watch the color